Is reverb supposed to be an ability word? It looks like i might be, but non-italics and the weird order of symbols make me wonder whether something else is going on.

The natural life cycle of a card suggests you'd cast this from hand before reverbing it from the graveyard, which is not the expeted order of these two effects. You'd expect to tutor for lands early in the game; once you have accumulated some lands you'd look to use the effect that makes all lands better (you'd need e. g. at least four basic lands before you break even on the additional mana).

Without the reverb stuff this is a two-man High Tide/Bubbling Muck in a more well chosen color. I'm really not certain that I like it at that spot either. Real mana doubling is meant to be abused, which is why Mana Reflection is so prohibitively cost: You usually have to wait a turn to get ahead with it.

I see this as a take on red rituals more than a take on green ramp. And considering modern levels of rituals, I'm not certain where this is compared to Geosurge.

It feels like the design is disjointed (though I'm not looking at the set context right now) in the sense that this is a mana fixing card that also wants you to play a lot of copies of the same basic land, which is not a good kind of tension, I imagine.

This is an ability word. I'll have to italicize Reverb on cards later.

The intention of cards with Reverb is that ability used from the graveyard should feel lesser but be adjacent to the instant or sorcery's normal effect.